Mitsubishi Outlander GS45X. Manual — part 857

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-361

.

CIRCUIT OPERATION

• The injector power is supplied from the injector

relay (terminal No. 3).

• The ECM controls the injector by turning the

power transistor in the ECM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The amount of fuel injected by the injector is con-

trolled by the amount of continuity time the coil is
grounded by the ECM.

.

DESCRIPTIONS OF MONITOR METHODS

The ECM detects open circuit and short malfunction.

.

MONITOR EXECUTION

Continuous

.

AK900139 AD

B-103 (GR)

Connector: B-103

AK700399AB

MFI relay

A-33X

Connector: A-33X

AK900134

AD

B-21 (B)

Connector: B-21

Intermediate
connector

AK700413AB

A-24X

Connector: A-24X

Injector relay

AK700401AB

ECM

B-10 (GR)

Connector: B-10

AK700414 AB

ETACS-ECU

C-317

Connectors: C-304, C-317

C-304

AK900602

Connector: A-13

A-13

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-362

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

DTC SET CONDITIONS <Circuit continuity

− open circuit and shorted low>

Logic Flow Chart

.

Check Condition

• Engine is running.

Judgement Criterion

• The supply voltage is 3 volts or less without the

injector driving for 2 seconds.

.

Good

Malfunction

Injector voltage < = 3V

Start

Continuous

failure for 2secs

End

No

No

Yes

Yes

Yes

No

AK700479

Monitoring

condition

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-363

DTC SET CONDITIONS <Circuit continuity

− shorted high>

Logic Flow Chart

.

Check Condition

• Engine is running.

Judgement Criterion

• The coil current is 4.5 ampere or more with the

injector driving for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 22

P.13B-11

.

.

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)

• No. 3 cylinder injector failed.

• Connector damage.

• Harness damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

Good

Malfunction

Current >= 4.5A

End

Yes

No

No

No

AK604332

Start

Yes

Yes

Continuous

failure for 2secs

Monitoring
condition

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-364

STEP 1. Using scan tool MB991958, check actuator test
item 1: No. 3 Injector.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for

item 1, No. 3 injector.

(4) Warm up the engine to normal operating temperature: 80

°C

to 95

°C (176°F to 203°F).

• The idle should become slightly rougher.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-15

.

NO : Go to Step 2.

STEP 2. Check for harness connector B- 21 at the
intermediate connector and B-10 at the ECM connector for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO : Repair it. Refer to GROUP 00E, Harness Connector

Inspection

P.00E-2

. Then go to Step 9.

STEP 3. Measure the injector supply voltage at the
intermediate connector harness B-21 and ground.
(1) Disconnect the intermediate connector B-21 and measure

at the female connector side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 6 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured resistance battery positive voltage?

YES : Go to Step 4.
NO : Check harness connector A-13 at intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector is in

good condition, repair harness wire between injector
relay connector A-24X (terminal No. 3) and
intermediate connector B-21 (terminal No. 6) because
of open circuit. Then go to Step 9.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

3

4

5

8

9

1

2

6

7

10

AK700296AB

B-21 harness
connector:
harness side